static char *nop_getline(void)
{
char *buffer, *p, *q;
int bufsize;
bufsize = BUF_DELTA;
buffer = nasm_malloc(BUF_DELTA);
src_set_linnum(src_get_linnum() + nop_lineinc);
while (1) { /* Loop to handle %line */
p = buffer;
while (1) { /* Loop to handle long lines */
q = fgets(p, bufsize - (p - buffer), nop_fp);
if (!q)
break;
p += strlen(p);
if (p > buffer && p[-1] == '\n')
break;
if (p - buffer > bufsize - 10) {
int offset;
offset = p - buffer;
bufsize += BUF_DELTA;
buffer = nasm_realloc(buffer, bufsize);
p = buffer + offset;
}
}
if (!q && p == buffer) {
nasm_free(buffer);
return NULL;
}
/*
* Play safe: remove CRs, LFs and any spurious ^Zs, if any of
* them are present at the end of the line.
*/
buffer[strcspn(buffer, "\r\n\032")] = '\0';
if (!nasm_strnicmp(buffer, "%line", 5)) {
int32_t ln;
int li;
char *nm = nasm_malloc(strlen(buffer));
if (sscanf(buffer + 5, "%"PRId32"+%d %s", &ln, &li, nm) == 3) {
nasm_free(src_set_fname(nm));
src_set_linnum(ln);
nop_lineinc = li;
continue;
}
nasm_free(nm);
}
break;
}
nop_list->line(LIST_READ, buffer);
return buffer;
}
/*
* segment registry
*/
static int32_t ieee_segment(char *name, int pass, int *bits)
{
/*
* We call the label manager here to define a name for the new
* segment, and when our _own_ label-definition stub gets
* called in return, it should register the new segment name
* using the pointer it gets passed. That way we save memory,
* by sponging off the label manager.
*/
if (!name) {
*bits = 16;
if (!any_segs)
return 0;
return seghead->index;
} else {
struct ieeeSection *seg;
int ieee_idx, attrs;
bool rn_error;
char *p;
/*
* Look for segment attributes.
*/
attrs = 0;
while (*name == '.')
name++; /* hack, but a documented one */
p = name;
while (*p && !nasm_isspace(*p))
p++;
if (*p) {
*p++ = '\0';
while (*p && nasm_isspace(*p))
*p++ = '\0';
}
while (*p) {
while (*p && !nasm_isspace(*p))
p++;
if (*p) {
*p++ = '\0';
while (*p && nasm_isspace(*p))
*p++ = '\0';
}
attrs++;
}
ieee_idx = 1;
for (seg = seghead; seg; seg = seg->next) {
ieee_idx++;
if (!strcmp(seg->name, name)) {
if (attrs > 0 && pass == 1)
nasm_error(ERR_WARNING, "segment attributes specified on"
" redeclaration of segment: ignoring");
if (seg->use32)
*bits = 32;
else
*bits = 16;
return seg->index;
}
}
*segtail = seg = nasm_malloc(sizeof(*seg));
seg->next = NULL;
segtail = &seg->next;
seg->index = seg_alloc();
seg->ieee_index = ieee_idx;
any_segs = true;
seg->name = NULL;
seg->currentpos = 0;
seg->align = 1; /* default */
seg->use32 = *bits == 32; /* default to user spec */
seg->combine = CMB_PUBLIC; /* default */
seg->pubhead = NULL;
seg->pubtail = &seg->pubhead;
seg->data = NULL;
seg->fptr = NULL;
seg->lochead = NULL;
seg->loctail = &seg->lochead;
/*
* Process the segment attributes.
*/
p = name;
while (attrs--) {
p += strlen(p);
while (!*p)
p++;
/*
* `p' contains a segment attribute.
*/
if (!nasm_stricmp(p, "private"))
seg->combine = CMB_PRIVATE;
else if (!nasm_stricmp(p, "public"))
seg->combine = CMB_PUBLIC;
else if (!nasm_stricmp(p, "common"))
seg->combine = CMB_COMMON;
else if (!nasm_stricmp(p, "use16"))
seg->use32 = false;
else if (!nasm_stricmp(p, "use32"))
seg->use32 = true;
else if (!nasm_strnicmp(p, "align=", 6)) {
seg->align = readnum(p + 6, &rn_error);
if (seg->align == 0)
seg->align = 1;
if (rn_error) {
seg->align = 1;
nasm_error(ERR_NONFATAL, "segment alignment should be"
" numeric");
}
switch ((int)seg->align) {
case 1: /* BYTE */
case 2: /* WORD */
case 4: /* DWORD */
case 16: /* PARA */
case 256: /* PAGE */
case 8:
case 32:
case 64:
case 128:
break;
default:
nasm_error(ERR_NONFATAL, "invalid alignment value %d",
seg->align);
seg->align = 1;
break;
}
} else if (!nasm_strnicmp(p, "absolute=", 9)) {
seg->align = SEG_ABS + readnum(p + 9, &rn_error);
if (rn_error)
nasm_error(ERR_NONFATAL, "argument to `absolute' segment"
" attribute should be numeric");
}
}
ieee_seg_needs_update = seg;
if (seg->align >= SEG_ABS)
define_label(name, NO_SEG, seg->align - SEG_ABS,
NULL, false, false);
else
define_label(name, seg->index + 1, 0L, NULL, false, false);
ieee_seg_needs_update = NULL;
if (seg->use32)
*bits = 32;
else
*bits = 16;
return seg->index;
}
}
static void elf_deflabel(char *name, long segment, long offset,
int is_global, char *special)
{
int pos = strslen;
struct Symbol *sym;
int special_used = FALSE;
#if defined(DEBUG) && DEBUG>2
fprintf(stderr,
" elf_deflabel: %s, seg=%ld, off=%ld, is_global=%d, %s\n",
name, segment, offset, is_global, special);
#endif
if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
/*
* This is a NASM special symbol. We never allow it into
* the ELF symbol table, even if it's a valid one. If it
* _isn't_ a valid one, we should barf immediately.
*/
if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
strcmp(name, "..got") && strcmp(name, "..plt") &&
strcmp(name, "..sym"))
error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
return;
}
if (is_global == 3) {
struct Symbol **s;
/*
* Fix up a forward-reference symbol size from the first
* pass.
*/
for (s = &fwds; *s; s = &(*s)->nextfwd)
if (!strcmp((*s)->name, name)) {
struct tokenval tokval;
expr *e;
char *p = special;
while (*p && !isspace(*p))
p++;
while (*p && isspace(*p))
p++;
stdscan_reset();
stdscan_bufptr = p;
tokval.t_type = TOKEN_INVALID;
e = evaluate(stdscan, NULL, &tokval, NULL, 1, error, NULL);
if (e) {
if (!is_simple(e))
error(ERR_NONFATAL, "cannot use relocatable"
" expression as symbol size");
else
(*s)->size = reloc_value(e);
}
/*
* Remove it from the list of unresolved sizes.
*/
nasm_free((*s)->name);
*s = (*s)->nextfwd;
return;
}
return; /* it wasn't an important one */
}
saa_wbytes(strs, name, (long)(1 + strlen(name)));
strslen += 1 + strlen(name);
sym = saa_wstruct(syms);
sym->strpos = pos;
sym->type = is_global ? SYM_GLOBAL : 0;
sym->size = 0;
if (segment == NO_SEG)
sym->section = SHN_ABS;
else {
int i;
sym->section = SHN_UNDEF;
if (nsects == 0 && segment == def_seg) {
int tempint;
if (segment != elf_section_names(".text", 2, &tempint))
error(ERR_PANIC,
"strange segment conditions in ELF driver");
sym->section = nsects;
} else {
for (i = 0; i < nsects; i++)
if (segment == sects[i]->index) {
sym->section = i + 1;
break;
}
}
}
if (is_global == 2) {
sym->size = offset;
sym->value = 0;
sym->section = SHN_COMMON;
/*
* We have a common variable. Check the special text to see
* if it's a valid number and power of two; if so, store it
* as the alignment for the common variable.
*/
if (special) {
int err;
sym->value = readnum(special, &err);
if (err)
error(ERR_NONFATAL, "alignment constraint `%s' is not a"
" valid number", special);
else if ((sym->value | (sym->value - 1)) != 2 * sym->value - 1)
error(ERR_NONFATAL, "alignment constraint `%s' is not a"
" power of two", special);
}
special_used = TRUE;
} else
sym->value = (sym->section == SHN_UNDEF ? 0 : offset);
if (sym->type == SYM_GLOBAL) {
/*
* There's a problem here that needs fixing.
* If sym->section == SHN_ABS, then the first line of the
* else section causes a core dump, because its a reference
* beyond the end of the section array.
* This behaviour is exhibited by this code:
* GLOBAL crash_nasm
* crash_nasm equ 0
*
* I'm not sure how to procede, because I haven't got the
* first clue about how ELF works, so I don't know what to
* do with it. Furthermore, I'm not sure what the rest of this
* section of code does. Help?
*
* For now, I'll see if doing absolutely nothing with it will
* work...
*/
if (sym->section == SHN_UNDEF || sym->section == SHN_COMMON) {
bsym = raa_write(bsym, segment, nglobs);
} else if (sym->section != SHN_ABS) {
/*
* This is a global symbol; so we must add it to the linked
* list of global symbols in its section. We'll push it on
* the beginning of the list, because it doesn't matter
* much which end we put it on and it's easier like this.
*
* In addition, we check the special text for symbol
* type and size information.
*/
sym->next = sects[sym->section - 1]->gsyms;
sects[sym->section - 1]->gsyms = sym;
if (special) {
int n = strcspn(special, " ");
if (!nasm_strnicmp(special, "function", n))
sym->type |= SYM_FUNCTION;
else if (!nasm_strnicmp(special, "data", n) ||
!nasm_strnicmp(special, "object", n))
sym->type |= SYM_DATA;
else
error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
n, special);
if (special[n]) {
struct tokenval tokval;
expr *e;
int fwd = FALSE;
char *saveme = stdscan_bufptr; /* bugfix? fbk 8/10/00 */
while (special[n] && isspace(special[n]))
n++;
/*
* We have a size expression; attempt to
* evaluate it.
*/
stdscan_reset();
stdscan_bufptr = special + n;
tokval.t_type = TOKEN_INVALID;
e = evaluate(stdscan, NULL, &tokval, &fwd, 0, error,
NULL);
if (fwd) {
sym->nextfwd = fwds;
fwds = sym;
sym->name = nasm_strdup(name);
} else if (e) {
if (!is_simple(e))
error(ERR_NONFATAL, "cannot use relocatable"
" expression as symbol size");
else
sym->size = reloc_value(e);
}
stdscan_bufptr = saveme; /* bugfix? fbk 8/10/00 */
}
special_used = TRUE;
}
}
sym->globnum = nglobs;
nglobs++;
} else
nlocals++;
if (special && !special_used)
error(ERR_NONFATAL, "no special symbol features supported here");
}
static long elf_section_names(char *name, int pass, int *bits)
{
char *p;
int flags_and, flags_or, type, align, i;
/*
* Default is 32 bits.
*/
if (!name) {
*bits = 32;
return def_seg;
}
p = name;
while (*p && !isspace(*p))
p++;
if (*p)
*p++ = '\0';
flags_and = flags_or = type = align = 0;
while (*p && isspace(*p))
p++;
while (*p) {
char *q = p;
while (*p && !isspace(*p))
p++;
if (*p)
*p++ = '\0';
while (*p && isspace(*p))
p++;
if (!nasm_strnicmp(q, "align=", 6)) {
align = atoi(q + 6);
if (align == 0)
align = 1;
if ((align - 1) & align) { /* means it's not a power of two */
error(ERR_NONFATAL, "section alignment %d is not"
" a power of two", align);
align = 1;
}
} else if (!nasm_stricmp(q, "alloc")) {
flags_and |= SHF_ALLOC;
flags_or |= SHF_ALLOC;
} else if (!nasm_stricmp(q, "noalloc")) {
flags_and |= SHF_ALLOC;
flags_or &= ~SHF_ALLOC;
} else if (!nasm_stricmp(q, "exec")) {
flags_and |= SHF_EXECINSTR;
flags_or |= SHF_EXECINSTR;
} else if (!nasm_stricmp(q, "noexec")) {
flags_and |= SHF_EXECINSTR;
flags_or &= ~SHF_EXECINSTR;
} else if (!nasm_stricmp(q, "write")) {
flags_and |= SHF_WRITE;
flags_or |= SHF_WRITE;
} else if (!nasm_stricmp(q, "nowrite")) {
flags_and |= SHF_WRITE;
flags_or &= ~SHF_WRITE;
} else if (!nasm_stricmp(q, "progbits")) {
type = SHT_PROGBITS;
} else if (!nasm_stricmp(q, "nobits")) {
type = SHT_NOBITS;
}
}
if (!strcmp(name, ".comment") ||
!strcmp(name, ".shstrtab") ||
!strcmp(name, ".symtab") || !strcmp(name, ".strtab")) {
error(ERR_NONFATAL, "attempt to redefine reserved section"
"name `%s'", name);
return NO_SEG;
}
for (i = 0; i < nsects; i++)
if (!strcmp(name, sects[i]->name))
break;
if (i == nsects) {
if (!strcmp(name, ".text"))
i = elf_make_section(name, SHT_PROGBITS,
SHF_ALLOC | SHF_EXECINSTR, 16);
else if (!strcmp(name, ".rodata"))
i = elf_make_section(name, SHT_PROGBITS, SHF_ALLOC, 4);
else if (!strcmp(name, ".data"))
i = elf_make_section(name, SHT_PROGBITS,
SHF_ALLOC | SHF_WRITE, 4);
else if (!strcmp(name, ".bss"))
i = elf_make_section(name, SHT_NOBITS,
SHF_ALLOC | SHF_WRITE, 4);
else
i = elf_make_section(name, SHT_PROGBITS, SHF_ALLOC, 1);
if (type)
sects[i]->type = type;
if (align)
sects[i]->align = align;
sects[i]->flags &= ~flags_and;
sects[i]->flags |= flags_or;
} else if (pass == 1) {
if (type || align || flags_and)
error(ERR_WARNING, "section attributes ignored on"
" redeclaration of section `%s'", name);
}
return sects[i]->index;
}
static void aout_deflabel (char *name, long segment, long offset,
int is_global, char *special)
{
int pos = strslen+4;
struct Symbol *sym;
int special_used = FALSE;
if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
/*
* This is a NASM special symbol. We never allow it into
* the a.out symbol table, even if it's a valid one. If it
* _isn't_ a valid one, we should barf immediately.
*/
if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
strcmp(name, "..got") && strcmp(name, "..plt") &&
strcmp(name, "..sym"))
error (ERR_NONFATAL, "unrecognised special symbol `%s'", name);
return;
}
if (is_global == 3) {
struct Symbol **s;
/*
* Fix up a forward-reference symbol size from the first
* pass.
*/
for (s = &fwds; *s; s = &(*s)->nextfwd)
if (!strcmp((*s)->name, name)) {
struct tokenval tokval;
expr *e;
char *p = special;
while (*p && !isspace(*p)) p++;
while (*p && isspace(*p)) p++;
stdscan_reset();
stdscan_bufptr = p;
tokval.t_type = TOKEN_INVALID;
e = evaluate(stdscan, NULL, &tokval, NULL, 1, error, NULL);
if (e) {
if (!is_simple(e))
error (ERR_NONFATAL, "cannot use relocatable"
" expression as symbol size");
else
(*s)->size = reloc_value(e);
}
/*
* Remove it from the list of unresolved sizes.
*/
nasm_free ((*s)->name);
*s = (*s)->nextfwd;
return;
}
return; /* it wasn't an important one */
}
saa_wbytes (strs, name, (long)(1+strlen(name)));
strslen += 1+strlen(name);
sym = saa_wstruct (syms);
sym->strpos = pos;
sym->type = is_global ? SYM_GLOBAL : 0;
sym->segment = segment;
if (segment == NO_SEG)
sym->type |= SECT_ABS;
else if (segment == stext.index) {
sym->type |= SECT_TEXT;
if (is_global) {
sym->next = stext.gsyms;
stext.gsyms = sym;
} else if (!stext.asym)
stext.asym = sym;
} else if (segment == sdata.index) {
sym->type |= SECT_DATA;
if (is_global) {
sym->next = sdata.gsyms;
sdata.gsyms = sym;
} else if (!sdata.asym)
sdata.asym = sym;
} else if (segment == sbss.index) {
sym->type |= SECT_BSS;
if (is_global) {
sym->next = sbss.gsyms;
sbss.gsyms = sym;
} else if (!sbss.asym)
sbss.asym = sym;
} else
sym->type = SYM_GLOBAL;
if (is_global == 2)
sym->value = offset;
else
sym->value = (sym->type == SYM_GLOBAL ? 0 : offset);
if (is_global && sym->type != SYM_GLOBAL) {
/*
* Global symbol exported _from_ this module. We must check
* the special text for type information.
*/
if (special) {
int n = strcspn(special, " ");
if (!nasm_strnicmp(special, "function", n))
sym->type |= SYM_FUNCTION;
else if (!nasm_strnicmp(special, "data", n) ||
!nasm_strnicmp(special, "object", n))
sym->type |= SYM_DATA;
else
error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
n, special);
if (special[n]) {
struct tokenval tokval;
expr *e;
int fwd = FALSE;
char *saveme=stdscan_bufptr; /* bugfix? fbk 8/10/00 */
if (!bsd) {
error(ERR_NONFATAL, "Linux a.out does not support"
" symbol size information");
} else {
while (special[n] && isspace(special[n]))
n++;
/*
* We have a size expression; attempt to
* evaluate it.
*/
sym->type |= SYM_WITH_SIZE;
stdscan_reset();
stdscan_bufptr = special+n;
tokval.t_type = TOKEN_INVALID;
e = evaluate(stdscan, NULL, &tokval, &fwd, 0, error, NULL);
if (fwd) {
sym->nextfwd = fwds;
fwds = sym;
sym->name = nasm_strdup(name);
} else if (e) {
if (!is_simple(e))
error (ERR_NONFATAL, "cannot use relocatable"
" expression as symbol size");
else
sym->size = reloc_value(e);
}
}
stdscan_bufptr=saveme; /* bugfix? fbk 8/10/00 */
}
special_used = TRUE;
}
}
/*
* define the references from external-symbol segment numbers
* to these symbol records.
*/
if (segment != NO_SEG && segment != stext.index &&
segment != sdata.index && segment != sbss.index)
bsym = raa_write (bsym, segment, nsyms);
sym->symnum = nsyms;
nsyms++;
if (sym->type & SYM_WITH_SIZE)
nsyms++; /* and another for the size */
if (special && !special_used)
error(ERR_NONFATAL, "no special symbol features supported here");
}
static long coff_section_names (char *name, int pass, int *bits)
{
char *p;
unsigned long flags, align_and = ~0L, align_or = 0L;
int i;
/*
* Default is 32 bits.
*/
if (!name)
*bits = 32;
if (!name)
return def_seg;
p = name;
while (*p && !isspace(*p)) p++;
if (*p) *p++ = '\0';
if (strlen(name) > 8) {
error (ERR_WARNING, "COFF section names limited to 8 characters:"
" truncating");
name[8] = '\0';
}
flags = 0;
while (*p && isspace(*p)) p++;
while (*p) {
char *q = p;
while (*p && !isspace(*p)) p++;
if (*p) *p++ = '\0';
while (*p && isspace(*p)) p++;
if (!nasm_stricmp(q, "code") || !nasm_stricmp(q, "text")) {
flags = TEXT_FLAGS;
} else if (!nasm_stricmp(q, "data")) {
flags = DATA_FLAGS;
} else if (!nasm_stricmp(q, "bss")) {
flags = BSS_FLAGS;
} else if (!nasm_stricmp(q, "info")) {
if (win32)
flags = INFO_FLAGS;
else {
flags = DATA_FLAGS; /* gotta do something */
error (ERR_NONFATAL, "standard COFF does not support"
" informational sections");
}
} else if (!nasm_strnicmp(q,"align=",6)) {
if (!win32)
error (ERR_NONFATAL, "standard COFF does not support"
" section alignment specification");
else {
if (q[6+strspn(q+6,"0123456789")])
error(ERR_NONFATAL, "argument to `align' is not numeric");
else {
unsigned int align = atoi(q+6);
if (!align || ((align-1) & align))
error(ERR_NONFATAL, "argument to `align' is not a"
" power of two");
else if (align > 64)
error(ERR_NONFATAL, "Win32 cannot align sections"
" to better than 64-byte boundaries");
else {
align_and = ~0x00F00000L;
align_or = (align == 1 ? 0x00100000L :
align == 2 ? 0x00200000L :
align == 4 ? 0x00300000L :
align == 8 ? 0x00400000L :
align == 16 ? 0x00500000L :
align == 32 ? 0x00600000L : 0x00700000L);
}
}
}
}
}
for (i=0; i<nsects; i++)
if (!strcmp(name, sects[i]->name))
break;
if (i == nsects) {
if (!flags) {
if (!strcmp(name, ".data"))
flags = DATA_FLAGS;
else if (!strcmp(name, ".bss"))
flags = BSS_FLAGS;
else
flags = TEXT_FLAGS;
}
i = coff_make_section (name, flags);
if (flags)
sects[i]->flags = flags;
sects[i]->flags &= align_and;
sects[i]->flags |= align_or;
} else if (pass == 1) {
if (flags)
error (ERR_WARNING, "section attributes ignored on"
" redeclaration of section `%s'", name);
}
return sects[i]->index;
}